[PIC16F877A] Thư viện LCD 4 bit

Đây là bộ thư viện LCD 4 bit dùng cho PIC16f877a mới một số thao tác trên LCD đủ dùng

#include "stddef.h"
#define LCD_RS          PIN_D2
#define LCD_EN          PIN_D3
#define LCD_D4          PIN_D4
#define LCD_D5          PIN_D5
#define LCD_D6          PIN_D6
#define LCD_D7          PIN_D7
// misc display defines-
#define Line_1          0x80
#define Line_2          0xC0
#define Clear_Scr       0x01
// prototype statements
#separate void LCD_Init(void);                  //Ham khoi tao LCD
#separate void LCD_SetPosition(unsigned int cX);//Thiet lap vi tri con tro
//Ham viet 1ky tu hoac 1 chuoi len LCD
#separate void LCD_PutChar(unsigned int cX);
#separate void LCD_PutCmd(unsigned int cX) ;    //Ham gui lenh len LCD
#separate void LCD_PulseEnable(void);               //Xung kich hoat
#separate void LCD_SetData(unsigned int cX);    //Dat du lieu len chan Data
#separate void WriteNum(unsigned char num);
#separate void HTsothapphan(Int32 num);
// Dinh nghia Cong
#use standard_io(B)
#use standard_io(A)
//Khoi tao LCD
#separate void LCD_Init (void)
{
    LCD_SetData (0x00);
    Delay_ms(20);                 // Cho cho LCD khoi tao >> 15ms
    output_low(LCD_RS);    // Che do gui lenh
    LCD_SetData(0x03);     // Khoi tao che do 4 bit
    LCD_PulseEnable();
    LCD_SetData(0x02);     // Tao giao dien 4 bit
    LCD_PulseEnable();     // send dual nibbles hereafter, MSN first
   LCD_PutCmd(0x2C);    // function set (all lines, 5x7 characters)
    LCD_PutCmd(0x0C);     // display ON, cursor off, no blink
   LCD_PutCmd(0x06);     // entry mode set, increment & scroll left
    LCD_PutCmd(0x01);     // clear display
}
#separate void LCD_SetPosition(unsigned int cX)
{
    /* this subroutine works specifically for 4-bit Port A */
    LCD_SetData(swap(cX)|0x08);
    LCD_PulseEnable();
    LCD_SetData(swap(cX));
    LCD_PulseEnable();
}
#separate void LCD_PutChar(unsigned int cX)
{
    /* this subroutine works specifically for 4-bit Port A */
    output_high(LCD_RS);
    LCD_PutCmd(cX);
    output_low(LCD_RS);
}
#separate void LCD_PutCmd(unsigned int cX)
{
    /* this subroutine works specifically for 4-bit Port A */
    LCD_SetData(swap(cX));     /* send high nibble */
    LCD_PulseEnable();
    LCD_SetData(swap(cX));     /* send low nibble */
    LCD_PulseEnable();
}
#separate void LCD_PulseEnable(void)
{
    output_high(LCD_EN);
    delay_us(5);        
    output_low(LCD_EN);
    delay_ms(5);        
}
#separate void LCD_SetData(unsigned int cX)
{
    output_bit(LCD_D4, cX & 0x01);
    output_bit(LCD_D5, cX & 0x02);
    output_bit(LCD_D6, cX & 0x04);
    output_bit(LCD_D7, cX & 0x08);
}
#separate void WriteNum(unsigned char num)
{
    unsigned char digit;
    digit = num/100;
    LCD_PutChar(digit + '0');           //write tram+ma ASCII cua '0'
    digit = num/10;
    digit = digit % 10;
    LCD_PutChar(digit + '0');           //write chuc
    digit = num % 100;
    digit = digit % 10;
   LCD_PutChar(digit + '0');           //write dvi
}
#separate void HTsothapphan(Int32 num)
 {
   Int8 Integer, First, Second, Third;
      Integer = num/1000 + 0x30;      // Tach phan nguyen
      num= num%1000;
      First = num/100 + 0x30;             // Tach phan le thu 1
      num = num%100;
      Second = num/10 + 0x30;             // Tach phan le thu 2
      Third = num%10 + 0x30;              // Tach phan le thu 3
      Lcd_putcmd(0xCA);
      Lcd_putchar(Integer);
      Lcd_putchar(".");
      Lcd_putchar(First);
      Lcd_putchar(Second);
      Lcd_putchar(Third);

 }